<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>检测是否是本地电话</title>
</head>
<body>
    <script>
        function testReg () {
            var str = prompt("请输入一组座机号码");
            if (/^\d{3,4}\-\d{7,8}$/.test(str)) {
                alert("输入正确，为本地号码");
            } else{
                alert("输入错误，非本地号码");
            }
        }
        testReg();
    </script>
</body>
</html>